Hello can anyone help me figure out why line 107 is causing this error? the list has over 10000items in it so this could be a reason. i've tried to remove duplicates. I copied this from the tutorial library. It won't let me upload the backtest I want. so it might not be line 107 but this is the offending code. 

if len(self.pair_list[0].a_price) != 0: